Seems rather shitty to me. I would think that they would wait until Palm complained, rather than basing the decision on an anonymous post. I doubt Palm would complain in any case, since it doesn't violate the Personal Edition license agreement. That, and no one gives a crap about BeOS any more anyway.
Although Vassily disagrees, I wouldn't rule out the Zeta folks as culprits. There is simply no one else who has anything to gain from this, but then I'm a conspiracy nut, so what do I know?
Anyway, I hope I can manage to get a copy before it goes away completely.